Gamma, E., Helm, R., Johnson, R., & Vlissides, J. (1995). Design patterns: Elements of reusable object-oriented software. Addison-Wesley.
Cita Chicago Style (17a ed.)Gamma, Erich, Richard Helm, Ralph Johnson, y John Vlissides. Design Patterns: Elements of Reusable Object-oriented Software. Reading, Mass.: Addison-Wesley, 1995.
Cita MLA (8a ed.)Gamma, Erich, et al. Design Patterns: Elements of Reusable Object-oriented Software. Addison-Wesley, 1995.
Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.